Should I let go?

So I grew up with this guy who I had the biggest crush on from like age 8 to 18. We were friends but he never really showed interest in me like that. He was a year older, went off to college, and we’ve never spoken since. It’s been 10 years now and I still think about him all the time.

We follow each other on social media but haven’t interacted at all. Still, he’s stuck in my head. In my mind he’s perfect. He’s super ambitious, really handsome, and we have the same upbringing, values, and even similar dreams. I don’t know him anymore but he’s been my idea of the dream guy for so long. i tried to move on and now I’m engaged to someone I care about and who’s good to me. But honestly I feel like I settled because I never believed I’d be good enough for the guy I really wanted. I want to be happy in my marriage and stop thinking about someone who probably hasn’t thought about me once in the last decade. But I keep wondering if I should just reach out. What if I’m wasting my one chance? What if he ends up marrying someone else and I never said anything? I don’t want to mess up my future but I also can’t get rid of this feeling.

Should I let it go or say something?